Read User Offset And Read User Slope Commands - Xylem YSI WaterLOG H-3301 Owner's Manual

Read User Offset and Read User Slope Commands

The H-3301/3311 processes the raw shaft encoder position with a mX+b equation. The slope (m)
and offset (b) terms are programmable, allowing the user to scale the position into other
engineering units. These commands allow the user to read the current slope and offset terms.
The slope is set to 0.005 and the offset to 0.000 at the factory. The H-3301/3311 has a mechanical
position resolution of 200 counts per revolution. When used with a pulley 1.0 feet in circumference:
0.005 feet/count x 200 counts/rev. = 1.0 feet/rev. The slope term can be changed for other pulley
diameters or for other units such as inches or meters.
Command
"aXRS!"
"aXRO!"
Where:
a is the sensor address ("0-9", "A-Z", "a-z", "*", "?").
XRS are upper case characters.
XRO are upper case characters.
This command takes 001 seconds to complete and places 1 value in the data buffer. Use the "aD0"
command to collect and view the slope or offset.
Example of an Extended "Read User Units Slope" command:
Command
"aXRS!"
Command
"aD0!"
Pulley Circumference
Response
"a0011<cr><lf>"
"a0011<cr><lf>"
Response
"a0011<cr><lf>"
Response
"a+0.005<cr><lf>"
12in
18in
375mm
750mm
SDI-12 Command & Response Protocol
Description
Read Slope
Read Offset
Time Values
1 sec 1
Description
Slope Reading is 0.005
Units
ft
ft
m
m
Description
Read Slope
Slope
0.005
0.0075
0.001875
0.00375
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